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###### Vaishnavi Mishra posted an Question
January 08, 2022 • 08:48 am 30 points
• IIT JAM
• Mathematics (MA)

## How to solve this

how to approach this problem plz explainnnnnnnnnnnn

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??

• ##### Vaishnavi mishra

LCM (2,3,5)= 30 hoga maximum greater than 2n

• ##### Vaishnavi mishra

sir , aise to n= 10 bhi ho sakta hai??

ans is 9

thank you

• ##### Navdeep goyal 1

maximum possible order is LCM of prime factor n=6 maximum possible order LCM(3,2,1)=6 so wrong n=8. maximum possible order LCM(3,5)=15 so wrong n=9 maximum possible order LCM(7,2)=14 so wrong n=10. maximum possible order LCM(3,7)=21 so right

n = 9 is the answer LCM (5,4) =20

4 is not prime

but the order is more than 2n

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